Clamp



B. J. CARTER CLAMP June 8 1926. 1,587,820

' Filed March 2 1, 1925 INVENTOR. Bsnmmn J. CARTER- ATTORNEY.

.lunc 8, 192$.

BERNARD J. CARTER, F KISSIMMEE, FLORIDA.

CLAMP.

Application filed March 2-4, 1925.

T his invention relates to clamping devices.

An important object of the invention is to provide a clamp having; a double adjustment whereby the work may be tightly and accurately held in position.

Er further object of the invention is the provision of a clamp of the above character which may be very accurately adjusted.

A still further object of the invention is the provision of a clamping device of the above kind which. is comparatively simple yet very durable of construction and eiiicient for the purpose intended.

,- Other objects and advantages of this invention will become apparent as the description progresses.

In the accon'ipanying drawing forming a part of this specification and in which like numerals are employed to designate corresponding parts throughout the same:

Figure 1 is a side elevation of the device comprising my invention partially broken away to illustrate the interior construction, and

Figure 52 is a transverse sectional view taken on the line 22 of Figure 1.

In the drawing, wherein for the purpose of illustration shown the preferred embodiment of my invention, the numeral 5 generally indicates the main bracket member which comprises a. longitudinal cylindrical body 6 provided with an internally screw threaded bore 7. Formed integral with the body and extending substantially right angular thereto is a tapered arm 8 carrying upon the opposite end thereof an angular projecting lug 9. The extremity of the lug 9 is provided with a circular engaging plate 10 somewhat larger in diameter than the lug to provide a substantial gripping surface.

Adjustably associated with the main bracket 5 is an auxiliary bracket 11 consisting of a longitudinal rod 12 circular in cross sect-ion and provided upon one portion there of with external threads 13 engageable with the threaded bore 7. Formed integral with the rod 12 and extending substantially at right angles from the opposite, extremity thereof is an auxiliary bracket arm 14 preferably heavier in construction than the rod member and provided on the end thereof with an angular boss 15 extending in parallel alignment with the rod 12.

It is obvious from the foregoing description that the main and auxiliary brac rots 5 im n'oveme-nts in Serial No. 18,014.

and 11 may be relatively adjusted by reverse rotary movement of the arm members increasing or lessening the distance between the plate 10 and boss 15 for engagement of suitable work. It is readily apparent how-- ever, that this relative movement of the main and auxiliary brackets will not provide sulficient adjustment for firmly engaging the work as a complete rotation of one of the brackets relative to the other is necessaryto bring the contacting surfaces in alignment.

It is therefore desirable to provide auxiliary adjusting means whereby the final engaging or clamping process may be accurately accomplished. With this in mind, one extremity of the auxiliary arm 14:, upon which is formed the boss 15, is provided with an internally screw threaded bore which an externally screw threaded bolt 16 tln eadedly mounted in the bore. The inner extremity of the bolt 16 carries a swivel head 17 rotatably mounted upon a suitable projection formed on the bolt for engagement with the work. Adjacent the opposite or outer extremity of the bolt 16 is a transversely positioned bar 18 provided at each extremity with spherical knobs 19 to permit convenient operation thereof.

In use, the work engaging member comprising the plate 10 and theswivel head 12' are first adjusted by rotar movement of the main and auxiliary brackets which will place these elements adjacent the work to be clamped. Final adjustment is then made by rotation of the bolt 16 relative to the auxiliary bracket. It is thus obvious that very fine adjustment of the clamp may be made without in any manner weakening the structure thereof. It will be noted that many clamping devices employing only a single adjusting unit have a tendency to permit movement of the contacting members, whereby the work is thrown out of alignment. This is due to a large extent to the contiparatively long movement of the adjusting member necessary to adapt the device upon work of various sizes. 1th my improved device it is apparent that each adjusting element bears a portion of the clamp movement and by this division of the clamp adjustinn' means the contacting members are retained in direct alignment.

It is to be understood that the form of my invention herewith shown and described is to be taken as the preferred example of the same, and that various changes as to the shape, size and arrangement otparts may he resorted to withoiit departing from the spirit of the invention, or the scope of the subjoined claims.

Having thus described my invention, I claim:

1. In a clamp of the class .deeeribed, a main bracketinclnding a body having an internally threaded bore, an angular arm formed on the said. body, and a" projection tornjedon the opposite end ot the arm vextending parallel Withthe saidbody; an auxiliary bracl ze' including a rod externally threaded on one extremitythereof, an angular'arni formed on the opposite extremity of the ,rod, .a hoes extending in alignment with the rod torn'iedon theopposite,endof the arm, the said. braeltet being adjustable by rotationot' the said rod Within the in ternally threaded bore, anxiliary adjusting meant incliid a ,holt fthi adedly mounted upon the aiiizili I head niounted on the bolt and means for readily actuating the said bolt.

In a imp of the class described, a main bracket including a longitiidinal body provided with an internally threaded bore, an angular arin torn ed on the said body, a projecting; lag torined on the opposite end of the arm piim ided with a plate,an aui'l" iar braelzet incli ding a longitudinal rod exterii ally threadetil on one extrenny, the said rod being engageable With the bore formed in the main lnraeket hotly, an area 't'ori'hed on the opposite end of the ar n provided vith an internally threaded bore, a bolt threadedly engage-able with the said here, a swivel hea mounted on the inner end ot the said bolt, and a transverse actur" arm extension, a swivel ating bar torinedon the opposite endoi" the said bolt.

'3. clamp comprising a main brael-zet oit ."nlar formation, one leg of the said bracket being Jrovided with an internally screw threaded bore, and an angular lug formed on the end of the opposite leg, an auxiliary bracket of angular torn'iatioi'i, one leg the-reel beingexternally screw threaded tor engagement with the bore formed in the main bracket, an angulx-ir lug fOl'll'lGflOl] the end ot the opposite leg" of the auxiliary bratet arranged in alignment with the lug form t on the main vbracket, and an auxiliar adjusting means mounted in the end of the auxiliary liraeliet including); a rotatable bolt adapted for longitudinal adjustment.

' l. A elainp conuprising' a nain bracket o'l angular formation, one leg of the bracket. he n provided with an internally screw threaded bore, and airangular l ng formed on the end otthe opposite leg; anauxiliary bracket of angular itorination, one leg there of being externally screw threaded i'or thr aded. en age nent with the bore formed in the r-at f bracket, a lag; fOl'lllQCl on. the

no opposite leg of the auxiliar3 end o'i t V bracket arranged in alignment with the lug formed on the inain bracket; and auxiliary adjusting ,IHOQIDS including an externally Screw threaded bolt threadedly mounted in the end of the auxiliary bracket adjustable toward and away from the lug forn'ied on the main bracket and means for readily rotating the said bolt.

In testimony Whereot I aflix my si nature.

lV EEI iNAR-D J. CARTER. 

